Soul Contract

The Soul Contract is a material. The game describes it as "A contract written in blood on paper that refuses to tear, something about years of torment, yada yada please sign on the line."

Robes
Description: While at low health, you rapidly recover mana.

This effect only takes place if the player is at 25% health or lower, regardless of material count and grade.

In Magicmaker, the player naturally regenerates 8 mana per second.

Spells
Description: Consumes health instead of mana for increased spellpower.

By default, the spell's health cost is 37.5% of the would-be mana cost, rounded up.

On wands, the mana cost is assumed to be approximately 1 when calculating the health cost.

Spells that cost too much health cannot be cast until the player has enough health.